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桥梁是交通基础设施中的重要组成部分,而桥梁挠度则是反映桥梁结构性能最为重要的技术参数之一。从国内外同类研究、同类技术中可实现桥梁结构挠度长期健康监测的方法中选择激光图像法,对其现有技术上所遇到的开发性价比合适的高质量点光源激光器和如何适当扩大光接受芯片标靶的测量范围两方面的难题进行了突破。研发了准直点激光投射式挠度监测方法,该方法是精确测量特别是大跨径桥梁挠度变化的一种有效方法。本文设计并成功安装了土坎乌江大桥准直点激光投射式挠度监测系统,并对该桥近期(2010.1～2010.6)监测数据进行分析,结果显示结构最大挠度在2cm以内,桥梁运行状况良好。该系统从08年安装至今一直运行正常,系统稳定性较好,实现了桥梁结构挠度的在线监测。
Bridges are an important part of traffic infrastructure, and bridge deflection is one of the most important technical parameters to reflect the performance of bridge structures. From the domestic and foreign researches and similar technologies, the long-term health monitoring of bridge structure can be used to select the laser image method. The development of the high quality point light source lasers with appropriate cost performance and the appropriate light source acceptance Chip target measuring range of two aspects of the problem of a breakthrough. A collimation point laser projection deflection monitoring method is developed. This method is an effective method to accurately measure the deflection of long-span bridge, especially. This paper designs and successfully installs the laser projection deflection monitoring system for the ridge Wujiang Bridge, and analyzes the monitoring data of the bridge recently (from 2010.1 to 2010.6). The results show that the maximum deflection of the structure is within 2cm and the bridge is in good condition. Since the system was installed in 2008, it has been operating normally and its system stability is good. It realizes on-line monitoring of the deflection of bridge structure.